Simplify CLI help menu + add command shortcuts

[gregwinn]

Summary

The winn help output is a flat list of 30+ lines. Reorganize it into grouped categories and add single-letter shortcuts for common commands.

Grouped Help Menu

Organize commands under: Development, Code Quality, Generators, Packages, Production.

Shortcuts

Shortcut	Command	Notes
r	run	new
s	start	new
t	test	new
f	fmt	new
l	lint	new
d	docs	new
w	watch	new
g	create	new (replaces c for create)
c	compile	changed (was create)
con	console	new
-h	help	new

Breaking Change

winn c switches from create → compile. Use winn g for generate/create going forward.

Acceptance Criteria

• All shortcuts work
• Help menu displays grouped categories
• cli.md updated with shortcuts
• CHANGELOG updated with breaking change note

[gregwinn]

Shipped in v0.9.0 — see commit 0cb22a8 (Add lint CLI command, shortcuts, grouped help menu).